If you don't have a sound level meter, buy one. (The Radio Shack models can be had for about $50.)
That can form the basis for really finding out how loud you listen and also what level bothers the neighbor. If you're a 100 dB kind of guy, you've got your work cut out for you.
However, the above suggestion about inviting the neighbor over and offering to work with him on both the volume and hours issue is a great idea. There is a fair (though certainly not absolute) chance he might try to meet you halfway.
That can form the basis for really finding out how loud you listen and also what level bothers the neighbor. If you're a 100 dB kind of guy, you've got your work cut out for you.
However, the above suggestion about inviting the neighbor over and offering to work with him on both the volume and hours issue is a great idea. There is a fair (though certainly not absolute) chance he might try to meet you halfway.